Concise hierarchy

(Kingdom) Animalia - (Phylum) Chordata - (Class) Mammalia

Phylogeny

Paraphyletic/Ancestral (para)

Ref: T. Rowe, 1988: 251.

Included, by definition, in node-based clade

Mammalia (Class) Linnaeus, 1758

Ref: M.C. McKenna & S.K. Bell, 1997: [35] (note 1: "monotremes").

Original position

Questionably Mammalia (Class) Linnaeus, 1758

Original entries

Questionably Platypoda (Order) Gill, 1872
Questionably Tachyglossa (Order) Gill, 1872

Current position

Mammalia (Class) Linnaeus, 1758

Ref: J. Kingdon et al., 2013: 102; Burgin et al., 2020: table 2 (p. 26).

Historical positions

Mammalia (Class) Linnaeus, 1758	Ref: C.J. Burgin et al., 2020: table 2 (p. 26). [implicit]
Mammalia (Class) Linnaeus, 1758	Ref: C. Groves & D. Happold, 2013: 102.
Mammalia (Class) Linnaeus, 1758	Ref: D.E. Wilson & D.M. Reeder, 2011: 56.
Mammalia (Class) Linnaeus, 1758	Ref: C.P. Groves, 2005: 1.
Mammalia (Class) Linnaeus, 1758	Ref: M.C. McKenna & S.K. Bell, 1997: 35.
Mammalia (Class) Linnaeus, 1758	Ref: R.L. Carroll, 1988: 627.
Mammalia (Class) Linnaeus, 1758	Ref: A.S. Romer & T.S. Parsons, 1986
Mammalia (Class) Linnaeus, 1758	Ref: A.F. DeBlase, 1982: 1015.
Mammalia (Class) Linnaeus, 1758	Ref: L. Margulis & K.V. Schwartz, 1982: 239.
Mammalia (Class) Linnaeus, 1758	Ref: T.I. Storer et al., 1979
Mammalia (Class) Linnaeus, 1758	Ref: W. Fiedler et al., 1973: [609].
Mammalia (Class) Linnaeus, 1758	Ref: M.C. McKenna, 1975: 40.
Mammalia (Class) Linnaeus, 1758	Ref: L.B. Halstead, 1974: 172.
Mammalia (Class) Linnaeus, 1758	Ref: G.G. Simpson, 1945

Number of Subtaxa

2025	Available in Systema Naturae 2000	1o;2f;3g;5s;9ss; †3o;5f;13g;15s
1989-present	Systema Naturae 2000: 21 Jul 2022	[1o;2f;3g;5s;9ss; †3o;5f;13g]
2020	C.J. Burgin et al.: table 2 (p. 26)	[1o;2f]
2013	C. Groves & D. Happold: 102	1o
2011	D.E. Wilson & D.M. Reeder: 56	1o;[2f]
2005	C.P. Groves: 1	1o;[2f;3g;5s;9ss]
1997	M.C. McKenna & S.K. Bell	[2o;2f;3g; †3g]
1988	R.L. Carroll: 627	[1o;2f; †2o;5f]
1982	A.F. DeBlase	1ic;1o;2f;[3g;4s]
1974	L.B. Halstead: 172	[1o]
1973	W. Fiedler et al.	1o;2f;3g;6s
1945	G.G. Simpson:	[1o]